Editor: Replace "Female" check box in NPC records with "Gender" combo box
Part 1/2 regarding the "Female" check box.
We currently use a "Female" check box to determine the gender of an NPC. This approach isn't very intuitive which is why we should replace the check box with a combo box ("Male", "Female"). This will also allow us to extend the list of gender types in the future.
(RM-3756 from redmine: created on 2017-02-17 by Martin Otto, , closed on 2017-02-18 by Martin Otto, relates #3757 (closed))